One question we often get at Springboards and More is "My diving board is squeaking -- what is the problem"?
The first thing you should do if your diving board is making strange noises is to do a visual inspection (while somebody is bouncing on the board) and try to determine from where the noise is coming. Is it the board itself or is it from the fulcrum area? Perhaps the hinge area? Maybe the guard rails? Could it be where the stand is bolted to the pool deck? Could it be a combination of some of these?
Often times, it is difficult to determine because noise travels so fast, it can be hard to pin point.
If you can isolate the noise, you should make the necessary adjustments to the fulcrum, guard rails, stand, etc. If you CANNOT isolate the noise, I would suggest you oil the hinges. Yes, that is correct -- oil the hinges. A Duraflex hinge has a "male" and "female" part that are held together with a (hinge) "pin" that is surrounded by four plastic Nyliners ("bushings") and an "O" ring at either end of the hinge pin to keep it from sliding out of the hinge.
You will notice that Duraflex hinges have a small hole in the center of the "male" portion. This is where you insert oil into the hinge assembly. (The Duraflex factory suggests 3 in 1 Oil). The hinges should be oiled every time you grease the fulcrum (about 2x per month). Every time the board is bounced, the hinge pin pivots inside the Nyliners and Hinge. If you do NOT oil the hinges, the (plastic) Nyliners (bushings) start to dry out and as the board is bounced, the hinge pins have difficulty pivoting inside the Nyliners and this is often times where you get the squeaking sound you hear when the board is bounced.
If the problem has persisted for quite some time, it is very possible that the Nyliners have cracked or broken and you may need to replace the hinge pin, the Nyliners and the "O" rings (aka the Hinge "Guts" Kit -- sold exclusively by Springboards and More).
Regardless of what needs to be done, remember the four "P's" and one "M" of diving board maintenance: Proper Maintenance Prevents Poor Performance (of your equipment).